I will intentionally set the charge at say 43.3 grains so I can trickle up to 42.5,
I hate to be the one to point this out, because it will sound like I'm being a smartass, but I'm not. I can see myself making exactly this mistake.
If you set your machine to 43.3 with the intention of trickling up to 42.5, you will always overthrow, because 43.3 is larger than 42.5.